Most people only have a handful of hair cycles (remember, a cycle is 6 - 8 years) where the pigment-producing cells that surround the follicle and transfer pigment are working at their best.
大多数人的头发周期不长(记住，一个周期是6 -8年)，此时色素细胞包围毛囊，色素的产生处于最佳状态。
For example, the ICFP 2007 Programming Contest involved implementing a virtual machine that modified its state with every cycle and ran for millions of cycles for some inputs (see Resources).
例如，ICFP 2007编程竞赛中有一个比赛就是实现一个虚拟机，要求每个周期都修改它的状态，并针对某些输入运行数百万个周期(请参阅参考资料)。
He had a profound impact on business-cycle research-his 1946 book, written with Wesley Clair Mitchell, was the seminal analysis of U.S. business cycles from 1854 to 1938.
他在商业周期研究领域有着深远的影响——他在1946年与韦斯利·克莱尔·米切尔合写的书中，富有创见地分析了从1854年到1938年的美国商业周期。
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